Has anyone tried using the CD/MD changer inputs as a generic aux input?

Yes, I have, but not with this head unit. My head unit (Eclipse) has changer controls, and it wasn't hard for the installer to tap into the sound outputs from the changer (I don't know if they're 1v or 4v - it doesn't really matter) with a Sony audio switch. The head unit thinks it's playing from the changer, and the changer is playing a disc, but sound's coming from the Empeg.
There are plenty of discussions on this in the Installations forum.
HTH.
Jason

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"WAY too happy about having #99."
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_~= Dearing =~_
Gettin' back into it thanks to slimrio!